3 syllables:
machinal, national, nationale, passional, rational

4 syllables:
binational, conational, cross-national, grand national, subnational, subrational, transnational, venational

5 syllables:
anti-national, antinational, declinational, internacional, international, internatonal, intranational, multinational, supernational, supranational, suprarational

6 syllables:
miscegenational

8 syllables:
marriott international, micro-star international, mondelez international, rotary international

9 syllables:
philip morris international, the family international

3 syllables:
lacrimal, taxable, campanile, practical, passable, madrigal, satiable, laughable, valuable, blastemal, cashable, manacle, fractional, clavicle, addable, affable, cascabel, tractable, palatal, actinal, tangible, casual, graspable, animal, anginal, nahuatl, mandible, fallible, actual, flammable, cannibal, acetyl, basketful, palpable, anodal, placable, addible, hasdrubal, capital, vaginal, radical, basophil, saxatile, radicle, actable, maximal, damnable, acapnial, acetal, astragal, battleful, blamable, canistel, canticle, fragmental, planetal, ratable, tamable, trackable

4 syllables:
extractable, admirable, matabele, invaluable, detachable, propranolol, pack animal, infallible, translatable, unchangeable, abactinal, impalpable, hexagonal, infrangible, unflappable, risk capital, compatible, inflammable, moss animal, tameable, marriageable, adaptable, unpassable, attachable, small capital, contrapuntal, collapsible, diagonal, impassable, intractable, expandable, free radical, spermatocele, grammatical, intangible, octagonal, expansible, implacable, fashionable, impractical, merchantable, block capital, collapsable, contractable, dead animal, draft animal, dutch capital, farm animal, french capital, greek capital, nontaxable, protractible, sea animal, state capital, unmatchable, work animal

5 syllables:
working capital, venture capital, understandable, semiannual, incompatible, belgian capital, british capital, cuban capital, danish capital, ethyl radical, finnish capital, german capital, gnawing animal, haitian capital, hemiacetal, interactional, irish capital, marine animal, methyl radical, noncollapsable, noncollapsible, nonretractable, russian capital, spanish capital, turkish capital, unadaptable, unattackable, ungrammatical, vinyl radical

6 syllables:
national capital, domestic animal, anagrammatical, angolan capital, australian capital, austrian capital, brazilian capital, cyanide radical, diagrammatical, egyptian capital, fictional animal, hawaiian capital, honduran capital, indian capital, italian capital, jamaican capital, japanese capital, laotian capital, malaysian capital, methylene radical, mexican capital, provincial capital

7 syllables:
operating capital, albanian capital, algerian capital, american capital, bulgarian capital, cambodian capital, canadian capital, hungarian capital, iranian capital, liberian capital, nicaraguan capital, nigerian capital, predatory animal, salvadoran capital

8 syllables:
panamanian capital